$a^7+1+a+1$
$\int\left(\pi^2-x^2\right)\cdot\cos\left(nx\right)dx$
$21x^{n+3}y^{m-1}:24x^{n+1}y^{m}$
$121-16z^4$
$\left(17x^3+103x\right)$
$3vw-2v+12w-8$
$\int\left(1+\sec\left(x\right)\right)^2dx$
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